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[unix-history] / usr / src / cmd / mount.c

#include <stdio.h>

#define NMOUNT  16
#define NAMSIZ  32

struct mtab {
       char    file[NAMSIZ];
       char    spec[NAMSIZ];
} mtab[NMOUNT];

main(argc, argv)
char **argv;
{
       register int ro;
       register struct mtab *mp;
       register char *np;
       int mf;

       mf = open("/etc/mtab", 0);
       read(mf, (char *)mtab, NMOUNT*2*NAMSIZ);
       if (argc==1) {
               for (mp = mtab; mp < &mtab[NMOUNT]; mp++)
                       if (mp->file[0])
                               printf("%s on %s\n", mp->spec, mp->file);
               exit(0);
       }
       if(argc < 3) {
               fprintf(stderr,"arg count\n");
               exit(1);
       }
       ro = 0;
       if(argc > 3)
               ro++;
       if(mount(argv[1], argv[2], ro) < 0) {
               perror("mount");
               exit(1);
       }
       np = argv[1];
       while(*np++)
               ;
       np--;
       while(*--np == '/')
               *np = '\0';
       while(np > argv[1] && *--np != '/')
               ;
       if(*np == '/')
               np++;
       argv[1] = np;
       for (mp = mtab; mp < &mtab[NMOUNT]; mp++) {
               if (mp->file[0] == 0) {
                       for (np = mp->spec; np < &mp->spec[NAMSIZ-1];)
                               if ((*np++ = *argv[1]++) == 0)
                                       argv[1]--;
                       for (np = mp->file; np < &mp->file[NAMSIZ-1];)
                               if ((*np++ = *argv[2]++) == 0)
                                       argv[2]--;
                       mp = &mtab[NMOUNT];
                       while ((--mp)->file[0] == 0);
                       mf = creat("/etc/mtab", 0644);
                       write(mf, (char *)mtab, (mp-mtab+1)*2*NAMSIZ);
                       exit(0);
               }
       }
       exit(0);
}